Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 4.8	$ 4.1
Accumulated depreciation and amortization	$ 394.7	$ 377.3
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Outstanding	42,793,123	42,848,359
Treasury Stock, Shares	11,017,098	10,840,173